Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3312t&link_type=abstract
American Astronomical Society, ESS meeting #2, #33.12
Astronomy and Astrophysics
Astronomy
Scientific paper
Dust growth by aggregation is an important process as the first step of planet formation in protoplanetary disks. Dust growth also influences the radiation field and/or the temperature structure in protoplanetary disks. However, we still have a large uncertainty in dust growth process. This uncertainty is mainly originated from unknown factors in the structure of growing dust aggregates and their collisional outcomes. It is still unclear what kind of structure dust aggregates have during their growth and how small impact velocity is required for their collisional sticking without major fragmentation. Furthermore, the collisional outcomes would be strongly dependent on the aggregate structure (the porosity, the number of connections among particles in the aggregate, charging, etc.). In recent years, many theoretical studies on aggregate collisions have been done (i.e., evolution of dust porosity or charging, the maximun impact velocity for dust growth, etc.). I will introduce remarkable results in these studies, focusing on results by our group.
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